Drill-jar piston



July 20 1926.

C. R. BRYSON DRILL JAR PIS'I'CN Filed April 2 vPatented July 20, 1926.

UNITED STATES* cmLEs n. :Bmrsom or PITTSBURGH, rENNsYLvANLA.

DRILL-Jan PIsroN.

'Application led April 25, 1925. Serial No. 25,890.

The present invention relates to drill jar pistons and more particularlyto a drill jarpiston havin'g a connecting shank formed of a fiexibletension member such as wire rope and a shield or spacer member.

In the drawings which illustrate the preferred embodiment of myinvention, Figure 1 is an elevation partly in section of the drill jarpiston. Figure 2 is a longitudinal section showing a modification.Figure 8 is a section along the line III- III of Figure 1 and Figures 4and 5 are detailed views showing the way in which the ends of the wirerope are secured.

In the illustrated embodiment of the invention a drill jar piston of thetype shown in my prior Patent No. 1,200,465, -is shown. It comprses'ahammer portion or head 4 and a body portion 5 which are connected bymeans of a shank formed of a piece of wire rope 6 having'its endsembedded in the head and body portions and' a metal sleeve 7 whichsurrounds the wire `rope and protects it from abrasion. The sleeveabut's against the head and body ortions to form a rigid spacer. It willt us be seen that kthe wire rope and the surrounding sleeve form asubstitute Vfor the usual integral shank portion of the piston. Figures4 and-5 illustrate the manner in which the ends of the rope are embeddedin the portions 4 and 5. Each end portion of the rope is tightly boundadjacent the extreme end thereof by means of 'a line wire or cord 8.4The end portion of the rope is then expanded by driving a wedge 9 ofsuitable material therein. The expanded portion of the rope is theninserted in a 'socket 10 formedin the portionv to which it is to beconnected, as illustrated in Figure 4. Such portion is then forged downto a reduced cross section, thereby firmly embedding the expanded endportion of the wire rope in such portion, as illusl ltrated in Figure 5.It will be appreciated that the wire rope constituting the shank portionof the piston is much more resistant to breakage than the integral shankof the `usual piston construction, since it allows a slight amount ofyield and is not as rigid asia shank forged integral with the head andbody portions.

In the modified construction shown in Figure 2 the wire rope 6a hasembedded therein a smaller wire rope 11 which ex in the liammer or headand body portionsl 4 and 5 of the piston. It will be appreciated\thatwith this construction if the hammer portion or the body portion shouldbecome fractured the embedded rope 11 will serve to temporarily hold theparts together and thus enable the drill jar to be drawnout of the wellfor repairs.

While I have specifically illustratedvand described my preferredstructure, it is to be understood that the invention may be otherwiseembodied within the scope of the following claims.

I claim:

1. A drill jar piston comprising a body, a v

head spaced therefrom, and piece of wire y' rope connecting the body andhead, the body and head portions being forged around the ends of therope to retain them.

2. A drill jar piston comprising a body, a head spaced therefrom, apiece of wire rope connecting the body and head, and a. protectingshield around the wire rope.

3. A drill jar piston` comprising a body, a head spaced therefrom, anda`shank convn'ecting the body and head formed of a piece of wire ropeand a spacer.

4. A drill jar piston comprising a body, a

head spaced therefrom, and a shank connecting the body and head formedof a. piece of wire rope chaving its ends embedded in the body and headand a rgid spacer abutting agalnst the body and ead, the body andheadportions being forged around the ends of the wire rope.

5.` A drill jar piston comprising a body, a head spaced therefrom, and ashank connecting the body and head formed of a piece of wire rope havingits ends embedded 1n the body and head and atube surrounding the v ropebetween the body and head.

6. A drill jar piston comprising a body, a head spaced therefrom, and ashank connecting the body and head formed of a flexible tension memberand a rigid spacer member.

7. A drill jar piston comprising a body, a head spaced therefrom, a wirerope of relatively small cross section embedded in the body and head andrunning axially therethrough, and a wire rope of relatively large crosssection connecting the body and head and enclosing the rst mentionedwire rope for at least a portion of its length.

8. A drill jar piston comprislng a head, a bod spaced therefrom, a wirero e of relative y small cross section embed ed 1n the body and head andrunning axially therethrough, a. wire rope of relatively large crosssection connecting the body and head and enclosing the iirst mentionedWire rope for l at least a portion of its length, the body and headportions being forged around the ends of the larger wire rope to retainthem, and

a rigid tubular shield and spacer surrounding the Wire rope between thebody and head. 10

In testimony whereof I have hereunto set my hand.

CHARLES R. BRYSON.

